The USB cable could be bad (replaceable), you may have failed to install the drivers/other software (download and install them from CD or from Sony's website), the USB port on your computer could be bad (try another USB port), or the USB port on the Walkman could be bad (not repairabale - call Sony and see if you can get an in-warranty replacement).

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It's hard to help very much without knowing what kind of MP3 player it is but for starters you should:1. Fully charge the device and then try plugging it in again2. If that doesn't work try a different USB cable and/or different USB port on your computer.Some players also have a reset button you could try.

Many people have found that their computers do not recognize the Eclipse mp3 Player, even after connecting with a USB cable. I had the same problem but discovered that the problem lies with the cables themselves. I have several USB 2.0 5-position cables that fit the Eclipse USB port perfectly, but only ONE of them actually works - the cable that came with the player itself. If you've lost this cable, you may be in trouble.

Attached is a screen-grab of the type of USB plug and port involved. You don't see them around very much anymore, and I have no further advice if your player doesn't have a USB port of this shape.

Some of mp3 player when we plug in to computer it requires the driver. But mostly is not so when you encountered your mp3 not recognized by the computer, try to use another USB cable. We don't know if the cable are bad or good, sometimes USB cable work fine and sometimes not. So use another cable.